my Skoda Octavia NFL (2020-Present) has a rough start, what could be wrong

Solution

1. Preparation

• Gather tools: OBD-II scanner, multimeter, socket set, torque wrench, fuel pressure gauge.
• Safety warning: Disconnect the battery before working on electrical systems.

2. Battery Inspection

• Sub-steps:
  1. Disconnect the negative terminal of the battery.
  2. Check the battery voltage with a multimeter; it should be above 12.4 volts.
  3. Clean any corrosion from terminals and ensure connections are tight.
  4. Reconnect the battery.

3. Fuel System Check

• Sub-steps:
  1. Locate the fuel pressure test port on the fuel rail.
  2. Connect the fuel pressure gauge and turn the ignition to the ON position without starting the engine.
  3. Check the fuel pressure; it should be within manufacturer specifications (typically 50-60 psi for this model).
  4. If pressure is low, inspect the fuel pump and filter for replacement.

4. Ignition System Repair

• Sub-steps:
  1. Remove the ignition coils from the spark plugs.
  2. Inspect spark plugs for wear or fouling; replace if necessary (use OEM replacement parts).
  3. Test ignition coils with a multimeter for proper resistance; replace faulty coils.
  4. Reinstall ignition components ensuring proper torque (consult repair manual for values).

5. Air Intake and Sensors

• Sub-steps:
  1. Inspect the air filter for blockage and replace if dirty.
  2. Check the MAF sensor for dirt or damage; clean with MAF cleaner if necessary.
  3. Ensure the throttle body is clean; remove and clean if needed.
  4. Reconnect all components and check for any vacuum leaks.